Insulating cup sleeve



FIG. 1 is a top, front and right perspective view of an insulating cup sleeve showing my new design;

FIG. 2 is a bottom, rear and left perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a right view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is an enlarged view of a portion labeled as 9 on FIG. 1 . 

CLAIM The ornamental design for an insulating cup sleeve, as shown and described. 